New Delhi: Unique Identification Authority of India (UIDAI) has joined government and PSU oil firms against the Supreme Court order making Aadhaar card not mandatory for availing social benefits saying, its directive has "very serious implications" in implementation of welfare schemes.

The UIDAI also contended that its order dated September 23, putting the onus on it to check that Aadhaar card should not be given to illegal immigrants, impinges on the jurisdiction of the appropriate authorities that are entrusted with the task of verifying citizenship.

In an application before the Supreme Court, the UIDAI submitted that Aadhaar is stated to be a proof of identity and there are other agencies to perform the task of verifying citizenship and detecting illegal immigrants.
"UIDAI has been mandated to provide Aadhaar to resident of India as a matter of conscious policy decision of government. Aadhaar is upfront stated to be a proof of identity not citizenship. It may be mentioned the government has specific agencies to perform the task of verifying citizenship and detecting illegal immigrants," it said.

"The interim order of the court in directing UIDAI to check the citizenship status of a person applying for Aadhaar and identifying illegal immigrants impinges on the jurisdiction of the appropriate authorities under law that are entrusted with this task," it said while pleading with the court to modify the interim order against which Centre and Oil PSUs have already approached the apex court.

The Authority said it is following a sound verification method for enrolment for Aadhaar and there is no proof that it has opened the "floodgates for entry of illegal migrants into the system".